package com.rt.tmpt.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;

import javax.servlet.*;
import java.io.IOException;

//@Component
public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {
	@Autowired
	private MyFilterInvocationSecurityMetadataSource securityMetadataSource;

	@Autowired
	public void setMyAccessDecisionManager(MyAccessDecisionManager accessDecisionManager) {
		super.setAccessDecisionManager(accessDecisionManager);
	}

	@Override
	public Class<?> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(servletRequest, servletResponse, filterChain);
		invoke(fi);
	}

	public void invoke(FilterInvocation fi) throws IOException, ServletException {
		//fi里面有一个被拦截的url
		//里面调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限
		//再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			//执行下一个拦截器
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		} finally {
			super.afterInvocation(token, null);
		}
	}
}




